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Impact of convective downdrafts on model simulations: results from aqua-planet integrations

Sahany, S and Nanjundiah, RS (2008) Impact of convective downdrafts on model simulations: results from aqua-planet integrations. In: Annales Geophysicae, 26 (7). pp. 1877-1887.

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The role of convective scale downdrafts has been examined, using the NCAR-CAM3.0 aqua-planet configuration. We find that, convective downdrafts make the atmosphere more unstable thus increasing the convective available potential energy (CAPE) of the atmosphere. It is noticed that, although the rate of CAPE consumption increases with the incorporation of downdrafts, the generation of CAPE increases with a higher rate. Also, it is noted that there is a reduction in the deep convective rainfall, with the inclusion of downdrafts, which is primarily due to the re-evaporation of precipitation within the downdrafts. There is a large increase in the low cloud fraction and the shortwave cloud forcing with the inclusion of convective scale downdrafts in the cumulus scheme, which along with the evaporation within the downdraft causes cooling in the troposphere.

Item Type: Journal Article
Publication: Annales Geophysicae
Publisher: European Geosciences Union
Additional Information: Copyright of this article belongs to European Geosciences Union.
Keywords: Meteorology and atmospheric dynamics;convective processes;precipitation;tropical meteorology.
Department/Centre: Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited: 06 Oct 2008 07:25
Last Modified: 06 Oct 2008 07:25
URI: http://eprints.iisc.ac.in/id/eprint/16162

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